device: 0.486
debug: 0.400
graphic: 0.358
network: 0.333
architecture: 0.314
boot: 0.313
i386: 0.312
performance: 0.309
virtual: 0.269
kernel: 0.235
semantic: 0.229
socket: 0.217
VMM: 0.209
files: 0.208
vnc: 0.184
user-level: 0.178
x86: 0.174
hypervisor: 0.174
register: 0.166
permissions: 0.144
arm: 0.137
peripherals: 0.117
risc-v: 0.107
mistranslation: 0.097
assembly: 0.087
ppc: 0.085
PID: 0.071
KVM: 0.060
TCG: 0.060

qemu-system-i386 verison 2.5.50 fails at lmsw instruction

I cloned qemu source code from github.com, and compiled it on my Kubuntu 15.10 laptop to run my little OS. When booting my little OS, the virtual machine's screen keep blinking, I guess it's the virtual machine rebooting on and on automatically for some unknown reason, but there is no further information shown on Kubuntu's terminal. I'm pretty sure this problem is not caused by my little OS, because it works just fine in qemu-system-i386 version 2.5.0.

I debugged my OS and find this problem happens when executing instruction "lmsw ax". Is this a bug, can anyone help me out?

Looking through old bug tickets... can you still reproduce this issue with the latest version of QEMU? Or could we close this ticket nowadays? If not, can you provide an example for testing?


[Expired for QEMU because there has been no activity for 60 days.]